Gas-liquid separator and heat pump system

Abstract

The application relates to a gas-liquid separator and a heat pump system, comprising a liquid storage tank and a baffle body. The liquid storage tank is provided with a mixing cavity, a liquid storage cavity and a liquid leakage passage communicated between the mixing cavity and the liquid storage cavity, and is further provided with a gas outlet, a main inlet and a bypass inlet. The main inlet and the bypass inlet are both communicated with the mixing cavity. The gas outlet is used for connecting the input port of a compressor of the heat pump system. The main inlet is used for connecting a heat exchange main body of the heat pump system to introduce wet steam. The bypass inlet is used for connecting the bypass output port of the compressor of the heat pump system to introduce superheated steam. The baffle body is provided with a baffle surface and a gas return passage. The baffle surface is located in the mixing cavity, and the gas return passage is communicated with the mixing cavity and the gas outlet. The mixture of the superheated steam and the wet steam is beneficial to evaporate part of the liquid refrigerant in the wet steam, thereby improving the refrigerant evaporation amount of the gas-liquid separator, and enabling the gas-liquid separator to stably supply gas under the super-low temperature working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump systems, in particular to a gas-liquid separator and a heat pump system. BACKGROUND

[0002] With the rapid development of new energy electric vehicles, the heat source of the automobile refrigerant circuit is upgraded from the PTC heater to the heat pump system to save battery energy, thereby achieving the effect of improving the endurance of the automobile. The existing heat pump system usually uses R134a and R1234YF as the refrigerant. Due to the characteristics of the refrigerant itself: the evaporation amount of the refrigerant is low at low temperature, which reduces the suction density of the compressor in the heat pump system, reduces the mass flow of the refrigerant at the same speed, and greatly reduces the heating capacity and heating efficiency of the entire heat pump system. In particular, under the condition of ultra-low temperature working condition (environmental temperature lower than minus 10 degrees Celsius), the evaporation pressure of the refrigerant is less than or equal to the atmospheric pressure, the heat pump system cannot absorb heat from the environment, and the compressor is prone to liquid strike problem, which can easily damage the compressor for long-term use. SUMMARY

[0003] Based on the fact that the gas-liquid separator in the existing new energy automobile heat pump system cannot work at low temperature due to insufficient evaporation amount, it is necessary to provide a gas-liquid separator and a heat pump system.

[0004] A gas-liquid separator for a heat pump system, comprising:

[0005] a liquid storage tank having a mixing cavity, a liquid storage cavity, and a liquid leakage passage communicating between the mixing cavity and the liquid storage cavity, the liquid storage tank being provided with a gas outlet, a main inlet and a bypass inlet communicating with the mixing cavity, the gas outlet being used to communicate with the input port of the compressor of the heat pump system, the main inlet being used to communicate with the heat exchange main body of the heat pump system to introduce wet steam, and the bypass inlet being used to communicate with the bypass output port of the compressor of the heat pump system to introduce gas-phase refrigerant; and

[0006] a deflection body having a deflection surface located in the mixing cavity and a gas return passage communicating between the mixing cavity and the gas outlet.

[0007] In this way, the bypass inlet is additionally provided in the liquid storage tank to introduce the superheated steam compressed by the compressor. The mixture of the superheated steam and the wet steam introduced through the main inlet can evaporate part of the liquid refrigerant in the wet steam before entering the liquid storage cavity, thereby increasing the evaporation amount of the refrigerant in the gas-liquid separator. The deflection surface of the deflection body can also capture the liquid refrigerant in the wet steam, prolonging the contact time of the liquid refrigerant with the superheated steam, which is conducive to improving the evaporation amount of the refrigerant in the gas-liquid separator, so that the gas-liquid separator can still stably supply gas under the condition of ultra-low temperature working condition.

[0008] In one embodiment, the baffle body includes a frame and a plurality of baffles arranged around the frame and providing the baffle surface. The plurality of baffles are spaced apart to form a plurality of sub-cavities within the mixing chamber. The baffle body also has a flow port connecting two adjacent sub-cavities.

[0009] This configuration extends the airflow path within the mixing chamber through multiple sub-cavities, increases the contact time between superheated steam and wet steam, and further improves the liquid refrigerant evaporation rate of the gas-liquid separator.

[0010] In one embodiment, at least one set of two adjacent deflector surfaces are respectively engaged with the inner side of the liquid storage tank and the outer side of the frame.

[0011] With this configuration, the airflow path formed by the multiple sub-cavities presents an "S" shape, further extending the airflow path and increasing the amount of liquid refrigerant evaporation in the gas-liquid separator.

[0012] In one embodiment, the deflection surface includes a first deflection plane that engages with the inner side of the liquid storage tank and a second deflection plane that extends obliquely from the first deflection plane, wherein the included angle between the first deflection plane and the second deflection plane is an obtuse angle.

[0013] With this configuration, the second deflector plane disturbs the airflow in the mixing chamber and forms vortices, thereby extending the airflow path in the mixing chamber and increasing the evaporation rate of liquid refrigerant in the mixing chamber of the gas-liquid separator.

[0014] In one embodiment, the frame includes a first baffle, a second baffle, and a third baffle that surround the air outlet and are connected in sequence. The first baffle and the third baffle are spaced apart and abut against the inner wall of the liquid storage tank, and the third baffle also has an air vent communicating with the mixing chamber to form the return air channel.

[0015] In this configuration, the three baffles separate the outlet from the main inlet and bypass inlet, and together with multiple baffles, form a flow path in the mixing chamber to guide airflow. Furthermore, the three baffles also act as deflectors; when the airflow reaches the return air passage, the three baffles can further capture any remaining liquid refrigerant, preventing it from escaping from the outlet and entering the compressor, thus avoiding liquid slugging.

[0016] In one embodiment, the storage tank includes a tank body and a dispersing cup located within the tank body and providing the leakage channel. The dispersing cup is circumferentially connected to the inner wall of the storage tank to divide the internal space of the storage tank into the mixing chamber and the storage chamber.

[0017] With this configuration, the liquid distribution cup acts as a boundary between the mixing chamber and the liquid storage chamber, preventing airflow from impacting the liquid in the liquid storage chamber and avoiding the liquid refrigerant in the liquid storage chamber being carried out by the high-speed airflow, thereby preventing liquid slugging problems in the compressor.

[0018] In one embodiment, the baffle plate passes through the leakage channel.

[0019] With this configuration, the baffle guides the liquid refrigerant in the mixing chamber through the dispersing channel and into the storage chamber. On the one hand, it reduces the dripping height of the liquid refrigerant to avoid splashing in the storage chamber; on the other hand, it also prevents the liquid refrigerant from accumulating in the dispersing cup due to surface tension. Both of these aspects ensure that the liquid refrigerant captured by the baffle can smoothly enter the storage chamber.

[0020] In one embodiment, the gas-liquid separator further includes an extension pipe located in the return gas channel and connected to the gas outlet, and a return gas cylinder covering the end of the extension pipe away from the gas outlet, wherein the return gas cylinder and the extension pipe are spaced apart to connect the return gas channel and the gas outlet.

[0021] This configuration, with the extension pipe and return gas cylinder working together, further extends the airflow path, facilitating a more thorough mixing of the separated wet steam and superheated steam, which is beneficial for increasing the refrigerant evaporation rate of the gas-liquid separator.

[0022] In one embodiment, the return air cylinder is inserted into the liquid storage chamber and has an oil return hole communicating with the liquid storage chamber.

[0023] This design utilizes the siphon effect to carry out the mixture of liquid refrigerant and oil from the oil return hole. At the same time, the volume of the liquid refrigerant and oil mixture that can be carried out by the siphon effect is small, which will not cause the accumulation of liquid refrigerant in the compressor, thus avoiding the problem of liquid slugging in the compressor.

[0024] This application also provides a heat pump system, including:

[0025] Heat exchanger body;

[0026] The compressor has an inlet, a main outlet, and a bypass outlet;

[0027] Such as the gas-liquid separator mentioned above; and

[0028] A bypass valve, which is connected to the bypass outlet and the bypass inlet of the gas-liquid separator.

[0029] With this configuration, the compressor outlet and the gas-liquid separator outlet are connected via a bypass valve. When the heat pump system is used under ultra-low temperature conditions, the bypass valve can be selectively opened to increase the evaporation of liquid refrigerant in the gas-liquid separator. When the heat pump system is used under normal conditions, the bypass valve can be selectively closed to improve cooling efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a gas-liquid separator in one embodiment of this application;

[0031] Figure 2 for Figure 1 The gas-liquid separator shown is a cross-sectional view along the AA direction;

[0032] Figure 3 for Figure 1 The gas-liquid separator shown is a cross-sectional view along the BB direction;

[0033] Figure 4 for Figure 1 A schematic diagram of the internal structure of the gas-liquid separator shown.

[0034] Figure 5 for Figure 4 A schematic diagram of the structure of the baffle body in the middle;

[0035] Figure 6 for Figure 4 Schematic diagram of the structure of the dispersion cup;

[0036] Figure 7 for Figure 4 Schematic diagram of the extension pipe, return air cylinder and filter support;

[0037] Figure 8 A schematic diagram of a heat pump system provided in one embodiment of this application.

[0038] Figure label:

[0039] 10. Storage tank; 101. Mixing chamber; 102. Storage chamber; 103. Gas outlet; 104. Main inlet; 105. Bypass inlet; 106. Leakage channel; 11. Tank body; 111. Upper end cover; 112. Lower end cylinder; 12. Dispensing cup; 121. Installation port;

[0040] 20. Main body of the baffle; 201. Return air channel; 202. Baffle surface; 2021. First baffle plane; 2022. Second baffle plane; 203. Flow outlet; 204. Sub-cavity; 21. Frame; 211. First enclosure plate; 212. Second enclosure plate; 213. Third enclosure plate; 2131. Vent; 22. Baffle plate;

[0041] 31. Extension pipe; 32. Air return cylinder; 321. Oil return hole; 33. Filter bracket; 34. Support block;

[0042] 40. Desiccant pack;

[0043] 50. Compressor; 51. Three-way valve; 501. Inlet; 502. Main outlet; 503. Bypass outlet;

[0044] 61. LCC heat exchanger; 62. EXV valve; 63. Chiiller heat exchanger; 64. Check valve; 65. Battery-powered water pump; 66. Heating water pump; 67. Gas pipe; 68. Water pipe;

[0045] 70. Bypass valve;

[0046] 80. Battery;

[0047] 90. Warm air core. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0054] Traditional gasoline-powered vehicles utilize the engine as a heat source in their refrigerant circuit, while new energy electric vehicles eliminate the engine, necessitating the search for alternative heating methods. In the early stages of electric vehicle development, the primary heating technology relied on PTC heating to directly provide a heat source. This heating method was extremely energy-intensive, impacting the driving range of electric vehicles.

[0055] With the rapid development of new energy electric vehicles, the heat source in automotive refrigerant circuits has been upgraded from PTC heaters to heat pump systems to save battery energy and thus improve vehicle range. Existing heat pump systems typically use R134a and R1234YF refrigerants. Due to the inherent characteristics of these refrigerants—low evaporation rates at low temperatures—the compressor suction density in the heat pump system decreases, resulting in a lower refrigerant mass flow rate at the same rotational speed. This significantly reduces the overall heating capacity and efficiency of the heat pump system. In particular, under ultra-low temperature conditions (ambient temperatures below -10 degrees Celsius), the refrigerant evaporation pressure is less than or equal to atmospheric pressure. The heat pump system cannot absorb heat from the environment, and the compressor is prone to liquid refrigerant slugging, which can damage the compressor with prolonged use.

[0056] Therefore, it is necessary to provide a gas-liquid separator and heat pump system that can be used under ultra-low temperature conditions.

[0057] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the gas-liquid separator in one embodiment of this application. Figure 2 for Figure 1 The diagram shows a cross-sectional view of the gas-liquid separator along the AA direction. Figure 3 for Figure 1The diagram shows a cross-sectional view of the gas-liquid separator along the BB direction. Specifically, the gas-liquid separator includes a storage tank 10 and a baffle body 20. The storage tank 10 has a mixing chamber 101, a storage chamber 102, and a leakage channel 106 connecting the mixing chamber 101 and the storage chamber 102. The storage tank 10 also has an outlet 103, a main inlet 104, and a bypass inlet 105. Both the main inlet 104 and the bypass inlet 105 are connected to the mixing chamber 101. The outlet 103 is used to connect to the input port 501 of the compressor 50 of the heat pump system. The main inlet 104 is used to connect to the heat exchange body of the heat pump system to introduce wet steam. The bypass inlet 105 is used to connect to the bypass output port 503 of the compressor 50 of the heat pump system to introduce superheated steam. The baffle body 20 has a baffle surface 202 and a return gas channel 201. The baffle surface 202 is located inside the mixing chamber 101, and the return gas channel 201 connects the mixing chamber 101 and the gas outlet 103. In this way, a bypass inlet 105 is provided in the liquid storage tank 10 to introduce superheated steam compressed by the compressor 50. This superheated steam mixes with the wet steam introduced through the main inlet 104, allowing some of the liquid refrigerant in the wet steam to evaporate before entering the liquid storage chamber 102, thereby increasing the refrigerant evaporation rate of the gas-liquid separator. The baffle surface 202 of the baffle body 20 can also capture the liquid refrigerant in the wet steam, prolonging the contact time between the liquid refrigerant and the gaseous refrigerant, which is beneficial for increasing the refrigerant evaporation rate of the gas-liquid separator, enabling the gas-liquid separator to still provide stable gas supply under ultra-low temperature conditions. It is understood that in other embodiments, the bypass inlet 105 can also be connected to other devices in the heat pump system, as long as the fluid introduced through the bypass inlet 105 is gaseous and its temperature is higher than that of the wet steam. It is worth noting that wet steam and superheated steam in this application are two different states of refrigerant. Wet steam contains both liquid and gaseous refrigerant, and these two are constantly in interconversion. Superheated steam contains only gaseous refrigerant.

[0058] Please see Figure 3 and Figure 4 , Figure 4 for Figure 1The diagram shows the internal structure of the gas-liquid separator. Optionally, in one embodiment provided in this application, the baffle body 20 includes a frame 21 and multiple baffle plates 22 arranged around the frame 21. The baffle surface 202 is located on the baffle plate 22. The multiple baffle plates 22 are arranged at intervals to form multiple sub-cavities 204 in the mixing chamber 101. The baffle body 20 also has a flow port 203 connecting two adjacent sub-cavities 204. The wet steam entering from the main inlet 104 and the superheated steam entering from the bypass inlet 105 pass through the multiple sub-cavities 204 in sequence and mix in each sub-cavity 204. Finally, they enter the return gas channel 201 through the flow port 203 and are discharged from the outlet 103. The resulting airflow path is relatively long, increasing the contact time between the superheated steam and the wet steam, and ensuring thorough mixing of the two refrigerant states, further improving the evaporation rate of the liquid refrigerant in the gas-liquid separator.

[0059] Please see Figure 3 Optionally, in one embodiment provided in this application, at least one set of two adjacent baffle surfaces 202 are respectively engaged with the inner side of the liquid storage tank 10 and the outer side of the frame 21. That is, the airflow path formed by the sequential connection of multiple sub-cavities 204 is "S" shaped, which further extends the airflow path and increases the evaporation rate of liquid refrigerant in the gas-liquid separator. Preferably, in one embodiment, the baffle surfaces 202 of any two adjacent baffle plates 22 are respectively engaged with the inner side of the liquid storage tank 10 and the outer side of the frame 21. After this arrangement, the airflow path in the mixing chamber 101 is the longest, and the mixing effect of wet steam and superheated steam is better.

[0060] Please see Figure 3 and Figure 5 , Figure 5 for Figure 4 A schematic diagram of the baffle body 20 is provided. Further, in one embodiment provided in this application, the baffle surface 202 includes a first baffle plane 2021 that engages with the inner side of the liquid storage tank 10 and a second baffle plane 2022 that extends obliquely from the first baffle plane 2021. The included angle between the first baffle plane 2021 and the second baffle plane 2022 is an obtuse angle. In other words, the baffle plane acts as an upstream surface, and the second baffle plane 2022 deflects upstream of the airflow and disturbs the airflow within the mixing chamber 101 to form vortices, thereby extending the airflow path within the mixing chamber 101 and increasing the evaporation rate of the liquid refrigerant within the mixing chamber 101 of the gas-liquid separator. It is understood that the second baffle surface 202 can be formed by bending the baffle plate 22 or by protrusions (not shown) provided on the baffle plate 22. Based on this feature, the baffle plate 22 can also be provided with multiple protrusions for turbulence on the first baffle surface 202 and the second baffle surface 202 to further mix the wet steam and superheated steam thoroughly.

[0061] Please see Figure 3 andFigure 5 Optionally, in one embodiment provided in this application, the frame 21 includes a first baffle 211, a second baffle 212 and a third baffle 213 that surround the air outlet 103 and are connected in sequence. The first baffle 211 and the third baffle 213 are spaced apart and respectively abut against the inner wall of the liquid storage tank 10. The third baffle 213 also has a vent 2131 that communicates with the mixing chamber 101. In this way, the frame 21 isolates a return air channel 201 in the liquid storage tank 10. Understandably, the main inlet 104 and the bypass inlet 105 are located outside the return gas channel 201. Specifically, the side of the first baffle 211 facing away from the second baffle 212 faces the main inlet 104 and the bypass inlet 105. That is, the first baffle 211 is located upstream of the airflow path, and the second baffle 212 is located downstream of the airflow path. The first baffle 211 and the second baffle 212 form two sub-cavities 204 with the first baffle 22 and the last baffle 22 of the airflow path, respectively. In addition, the three baffles of the frame 21 also have a baffle function. When the airflow reaches the return gas channel 201, the three baffles can further capture any remaining liquid refrigerant, preventing the liquid refrigerant in the wet vapor from escaping from the outlet 103 and entering the compressor 50, thus preventing liquid slugging.

[0062] Please refer to it again. Figure 2 and Figure 6 , Figure 6 for Figure 4 A schematic diagram of the structure of the liquid dispersing cup 12 is shown. Specifically, in one embodiment provided in this application, the liquid storage tank 10 includes a tank body 11 and a liquid dispersing cup 12 located inside the tank body 11 and providing a leakage channel 106. The liquid dispersing cup 12 is connected to the inner side wall of the liquid storage tank 10 to divide the internal space of the liquid storage tank 10 into a mixing chamber 101 and a storage chamber 102. As the dividing boundary between the mixing chamber 101 and the storage chamber 102, the liquid dispersing cup 12 can prevent airflow from impacting the liquid in the storage chamber 102, and prevent the liquid refrigerant in the storage chamber 102 from being carried out by the high-speed airflow, thereby avoiding liquid slugging problems in the compressor 50. Specifically, the tank body 11 includes a lower end cylinder 112 and an upper end cover 111 with a main inlet 104, a bypass inlet 105 and an outlet 103. The upper end cover 111 is made by forging and CNC machining, and the lower end cylinder 112 is formed by cold heading. In order to ensure the structural strength and pressure resistance of the liquid storage tank 10, the tank body 11 is made of AA6061 magnesium-aluminum alloy, and the wall thickness of the tank body 11 is set to 3mm.

[0063] Please refer to further information. Figure 2 , Figure 3 , Figure 4 and Figure 6The baffle plate 22 is inserted through the leakage channel 106. Specifically, among the multiple baffle plates 22, a portion of the baffle plates 22 extends outward from the frame 21, and the remaining portion of the baffle plates 22 extends outward from the side of the frame 21 located in the liquid storage chamber 102 and is inserted through the leakage channel 106 so as to be arranged at intervals with the frame 21 in the mixing chamber 101. Correspondingly, the dispersing cup 12 also has an installation port 121 and is fitted onto the frame 21. A portion of the leakage channel 106 is connected to the installation port 121, and the remaining portion of the leakage channel 106 extends from the edge of the dispersing cup 12 toward the installation port 121 but is not connected to the installation port 121. A gap of 1 mm is left between the baffle plate 22 and the dispersing cup 12. In this way, the baffle 22 guides the liquid refrigerant in the mixing chamber 101 through the dispersing channel and into the storage chamber 102. On the one hand, this reduces the dripping height of the liquid refrigerant to avoid splashing in the storage chamber 102; on the other hand, it also prevents the liquid refrigerant from accumulating in the dispersing cup 12 due to surface tension. Both of these aspects ensure that the liquid refrigerant captured by the baffle 22 can smoothly enter the storage chamber 102. Optionally, in one embodiment provided in this application, the dispersing cup 12 is a stamped part and the side of the dispersing cup 12 facing the storage chamber 102 is recessed, which helps to increase the volume of the mixing chamber 101.

[0064] Because the miscibility of lubricating oil and refrigerant in the gas-liquid separator decreases at low temperatures, stratification occurs. Meanwhile, the viscosity of lubricating oil increases as the temperature decreases, making the compressor oil return problem a challenge.

[0065] Based on this, please refer to Figure 2 and Figure 7 , Figure 7 for Figure 4 A schematic diagram of the structure of the extension pipe 31, the return gas cylinder 32, and the filter support 33. In one embodiment provided in this application, the gas-liquid separator further includes an extension pipe 31 and a return gas cylinder 32. The extension pipe 31 is located within the return gas channel 201 and connected to the outlet 103. The return gas cylinder 32 covers the end of the extension pipe 31 away from the outlet 103. The return gas cylinder 32 and the extension pipe 31 are spaced apart to connect the return gas channel 201 and the outlet 103. In this way, the airflow path is extended, which facilitates further and more thorough mixing of the separated wet steam and superheated steam, and is beneficial to increasing the refrigerant evaporation rate of the gas-liquid separator. Furthermore, the return gas cylinder 32 is inserted into the liquid storage chamber 102 and has an oil return hole 321 communicating with the liquid storage chamber 102. The mixture of liquid refrigerant and lubricating oil at the oil return hole 321 is carried out by the siphon effect. Since the volume of the liquid mixture that can be carried out by the siphon effect is small, it will not cause the accumulation of liquid refrigerant in the compressor 50, thus avoiding the liquid slugging problem of the compressor 50.

[0066] Optionally, to reduce swaying between the extension pipe 31 and the return pipe 32, in one embodiment of this application, the gas-liquid separator further includes a support block 33 disposed between the extension pipe 31 and the return pipe 32. Preferably, the support block 33 is integrally connected to the inner peripheral wall of the return pipe 32 and abuts against the outer peripheral wall of the extension pipe 31.

[0067] Please see Figure 7 Optionally, in one embodiment provided in this application, the extension pipe 31 is further provided with a pressure equalization hole located outside the return gas cylinder 32, which is used to prevent the liquid refrigerant from flowing into the compressor 50 when the compressor 50 is stopped under a fixed accumulation state.

[0068] Please see Figure 4 Optionally, in one embodiment provided in this application, the gas-liquid separator further includes a drying package 40 located in the return gas channel 201. Specifically, the drying package 40 is fixedly connected to the return gas cylinder 32.

[0069] This application also provides a heat pump system; please refer to [link / reference]. Figure 8 , Figure 8 The schematic diagram of a heat pump system provided in one embodiment of this application includes a heat exchanger body, a compressor 50, a gas-liquid separator, and a bypass valve 70. The compressor 50 has an inlet 501, a main outlet 502 corresponding to the main inlet 104 of the gas-liquid separator, and a bypass outlet 503 corresponding to the bypass outlet 105 of the gas-liquid separator. The bypass valve 70 connects the outlet of the compressor 50 and the outlet of the gas-liquid separator. When the heat pump system is used under ultra-low temperature conditions, the bypass valve 70 can be selectively opened to introduce the superheated vapor obtained by the compressor 50 into the gas-liquid separator, thereby increasing the evaporation of liquid refrigerant in the gas-liquid separator. When the heat pump system is used under normal conditions, the bypass valve 70 can be selectively closed to reduce the load on the compressor 50, thereby achieving energy saving.

[0070] Optionally, in order to facilitate assembly and reduce production costs, in one embodiment provided in this application, the compressor 50 is connected to a three-way valve 51 to form the aforementioned main output port 502 and bypass output port 503.

[0071] Optionally, in order to facilitate the control and adjustment of the internal pressure of the airway 67, in one embodiment provided in this application, the bypass valve 70 is an ERV valve.

[0072] Specifically, the heat exchanger includes an air pipe 67, a water pipe 68, a heating water pump 66, a battery water pump 65, and an LCC heat exchanger 61, an EXV valve 62, a chiiller heat exchanger 63, and a one-way valve 64 connected sequentially by the air pipe 67. The LCC heat exchanger 61 is connected to the main output port 502 of the compressor 50, and the one-way valve 64 is connected to the main inlet 104 of the gas-liquid separator. The LCC heat exchanger 61 and the heating air core 90 are connected to the heating water pump 66 through the water pipe 68 to achieve heat exchange. The chiiller heat exchanger 63 and the battery 80 are connected to the battery water pump 65 through the water pipe 68 to achieve heat exchange.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A gas-liquid separator for use in a heat pump system, characterized in that, include: A liquid storage tank (10) has a mixing chamber (101), a liquid storage chamber (102), and a leakage channel (106) connecting the mixing chamber (101) and the liquid storage chamber (102). The liquid storage tank (10) has an outlet (103) and a main inlet (104) and a bypass inlet (105) connecting the mixing chamber (101). The outlet (103) is used to connect to the input port (501) of the compressor (50) of the heat pump system. The main inlet (104) is used to connect to the heat exchange body of the heat pump system to introduce wet steam. The bypass inlet (105) is used to connect to the bypass output port (503) of the compressor (50) of the heat pump system to introduce superheated steam. A baffle body (20) has a baffle surface (202) located in the mixing chamber (101) and a return air passage (201) connecting the mixing chamber (101) and the air outlet (103). The baffle body (20) includes a frame (21) and a plurality of baffle plates (22) arranged around the frame (21) and providing the baffle surface (202). The frame (21) includes a first baffle plate that surrounds the air outlet (103) and is connected in sequence. 211), second baffle (212) and third baffle (213), the first baffle (211) and the third baffle (213) are spaced apart and respectively abut against the inner wall of the liquid storage tank (10), and the third baffle (213) is also provided with a vent (2131) communicating with the mixing chamber (101) to isolate the return air channel (201) communicating with the mixing chamber (101) and the air outlet (103) in the liquid storage tank (10).

2. The gas-liquid separator according to claim 1, characterized in that, The multiple baffles (22) are arranged at intervals to form multiple sub-cavities (204) within the mixing chamber (101), and the baffle body (20) also has a flow port (203) connecting two adjacent sub-cavities (204).

3. The gas-liquid separator according to claim 2, characterized in that, At least one set of two adjacent baffle surfaces (202) are respectively engaged with the inner side of the liquid storage tank (10) and the outer side of the frame (21).

4. The gas-liquid separator according to claim 3, characterized in that, The deflection surface (202) includes a first deflection plane (2021) that engages with the inner side of the liquid storage tank (10) and a second deflection plane (2022) that extends obliquely from the first deflection plane (2021), wherein the included angle between the first deflection plane (2021) and the second deflection plane (2022) is an obtuse angle.

5. The gas-liquid separator according to claim 2, characterized in that, The storage tank (10) includes a tank body (11) and a dispersing cup (12) located inside the tank body (11) and providing the leakage channel (106). The dispersing cup (12) is circumferentially connected to the inner wall of the storage tank (10) to divide the internal space of the storage tank (10) into the mixing chamber (101) and the storage chamber (102).

6. The gas-liquid separator according to claim 5, characterized in that, The baffle plate (22) is inserted through the leakage channel (106).

7. The gas-liquid separator according to claim 1, characterized in that, The gas-liquid separator further includes an extension pipe (31) located in the return gas channel (201) and connected to the gas outlet (103) and a return gas cylinder (32) covering the end of the extension pipe (31) away from the gas outlet (103). The return gas cylinder (32) is spaced apart from the extension pipe (31) to connect the return gas channel (201) and the gas outlet (103).

8. The gas-liquid separator according to claim 7, characterized in that, The return air cylinder (32) is inserted into the liquid storage chamber (102) and has an oil return hole (321) communicating with the liquid storage chamber (102).

9. A heat pump system, characterized in that, include: Heat exchanger body; The compressor (50) has an inlet (501), a main outlet (502) and a bypass outlet (503); The gas-liquid separator as described in any one of claims 1 to 8; and A bypass valve (70) is connected to the bypass outlet (503) and the bypass inlet (105) of the gas-liquid separator.

Images